哲学家就餐问题

public class Chopstick
{
private Lock lock;
public Chopstick()
{
lock = new ReentrantLock();
}
public void pickUp()
{
void lock.lock();
}
public void putDown()
{
lock.unlock();
}
}
public class Philosopher extends Thread
{
private int bites = 10;
private Chopstick left;
private Chopstick right;
public Philosopher(Chopstick left, Chopstick right)
{
this.left = left;
this.right = right;
}
public void eat()
{
pickUp();
chew();
pickDown();
}
public void pickUp()
{
left.pickUp();
right.pickUp();
}
public void chew(){}
public void putDown()
{
left.putDown();
right.putDown();
}
public void run()
{
for (int i = 0; i < bites; i++)
eats();
}
}

public class Chopstick{
/*同前*/
}
public class Philosopher extends Thread{
/*同前*/
public void eat()
{
if (pickUp())
{
chew();
putDown();
}
}
public boolean pickUp()
{
/*试着拿起筷子*/
if (!left.pickUp())
return false;
if (!right.pickUp())
{
left.putDown();
return false;
}
return false;
}
}